scholarly journals Observations on the occurrence of Erysiphales on cucumbers in Poland

2014 ◽  
Vol 20 (1) ◽  
pp. 63-69
Author(s):  
J. Bażant
Keyword(s):  
Conidial Germination ◽  
Sphaerotheca Fuliginea ◽  
Erysiphe Cichoracearum ◽  
Perfect Stage ◽  
Conidial Stage

In the years 1974-79 in Skierniewice and in 12 other places <i>Erysiphe cichoracearum </i>DC (imperfect stage) was observed on cucumbers in 1979 both <i>A. cichoraceum</i> and <i>Sphaerotheca fuliginea</i> were found in Skierniewice, Zielonka and Gołębiewo. Then were distinguished in the conidial stage mainly on the basis of differences in conidial germination and the presence or absence of fibrous bodies, and in the perfect stage on the basis of the number of asci in peridia and the number of spores per ascus.

scholarly journals Foliar Applications of Potassium Silicate Reduce Severity of Powdery Mildew on Cucumber, Muskmelon, and Zucchini Squash

1992 ◽  
Vol 117 (6) ◽  
pp. 902-905 ◽  
Author(s):  
Jim Menzies ◽  
Pat Bowen ◽  
David Ehret ◽  
Anthony D.M. Glass
Keyword(s):  
Powdery Mildew ◽  
Active Ingredient ◽  
Potassium Silicate ◽  
Separate Experiment ◽  
Distilled Water ◽  
Sphaerotheca Fuliginea ◽  
Erysiphe Cichoracearum ◽  
Foliar Sprays ◽  
Application Methods ◽  
Nutrient Solutions

The effect of soluble potassium silicate applied to cucumber (Cucumis sativus L.), muskmelon (C. melo L.), and zucchini squash (Cucurbita pepo L.) on the severity of powdery mildew was examined. Application methods included amending nutrient solutions to a concentration of 1.7 mm Si and foliar sprays containing 1.7, 8.5, 17, and 34 mm Si. Untreated plants and plants sprayed with distilled water were used as controls. The leaves of all plants were inoculated with known concentrations of conidia of Sphaerotheca fuliginea (Schlecht.:Fr.) Poll. (cucumber and mu&melon) or Erysiphe cichoracearum DC.: Merat (zucchini squash) 1 day after the sprays were applied. Inoculated leaves on plants receiving the Si-amended nutrient solution or foliar sprays of ≥ 17.0 mm Si developed fewer powdery mildew colonies than those on control plants. Results of a separate experiment that included a potassium spray, indicated that the active ingredient of the potassium silicate sprays appears to be Si. Experiments to test the persistence of Si foliar sprays on cucumber demonstrated that a 17 mm Si spray applied 7 days before inoculation with S. fuliginea reduced mildew colony formation.

scholarly journals Distribution of cucurbit powdery mildew species in the Czech Republic

2017 ◽  
Vol 38 (SI 2 - 6th Conf EFPP 2002) ◽  
pp. 415-416 ◽  
Author(s):  
E. Křístková ◽  
A. Lebeda ◽  
B. Sedláková ◽  
M. Duchoslav
Keyword(s):  
Czech Republic ◽  
Powdery Mildew ◽  
Sphaerotheca Fuliginea ◽  
The Czech Republic ◽  
Disease Symptoms ◽  
Erysiphe Cichoracearum ◽  
Ampelomyces Quisqualis ◽  
Fast Spreading ◽  
Cucurbit Powdery Mildew

The occurrence of Erysiphe cichoracearum (Ec) and Sphaerotheca fuliginea (Sf), causal agents of cucurbit powdery mildew<br />in the Czech Republic (CR) was studied in the period of 1995–2001. Nearly 800 leaf samples with disease symptoms<br />were microscopically examined. Ec is the predominating species, detected on 98% of locations. It was accompanied by Sf<br />on 24% of locations. The occurrence of Sf as the only powdery mildew species was proved on 2% of locations. Recent<br />occurrence of Sf in the CR corresponds with data on Sf fast spreading and prevailing on cucurbits in West and South<br />Europe. However, Ec is the strongly predominating powdery mildew species largely distributed throughout the country.<br />The hyperparasitic fungus Ampelomyces quisqualis was detected on 30% of samples.

Incidence of powdery mildew on cucurbit plants in Katsina, Nigeria

2019 ◽  
pp. 05-09
Keyword(s):  
Powdery Mildew ◽  
Low Cost ◽  
Frequency Of Occurrence ◽  
Sphaerotheca Fuliginea ◽  
Causal Organism ◽  
Powdery Mildews ◽  
Powdery Mildew Disease ◽  
Important Disease

The presence study deals with powdery mildews in various cucurbits in Katsina city (Barhim Estate, Kofar Durbi, Kofar Sauri, Kofar Marusa and Low Cost), Nigeria. The finding shows that the areas infested with powdery mildew is one of the important disease of cucurbits. The Sphaerotheca fuliginea was identified to be the causal organism present on all observed cucurbits in the study. Highest frequency of disease was found in Kofar Sauri(79%) fallowed by Kofar Marusa (68%), Kofar Durbi (66%), Barhim Estate (65%) and the lowest frequency of occurrence of disease was found in Low Cost (55%).The intensity of the disease was moderate to severe in general but it was high in many fields, the area-wise variation was also noticed. On vegetables, the highest frequency of occurrence of powdery mildew disease was observed on L. cylindrica (76.4%) followed by C. moschata (60%), C. sativus (59.3%), C. vulgaris (53.9%) and lowest was found on C. melo (44.4%). The highest intensity of disease was found on C. moschata, followed by L. cylindrica, C. sativus, C. vulgaris and C. melo.

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